CEDAR: Polar Summer Mesospheric Dynamics from Cloud Tracking with AIM CIPS (Aeronomy of Ice Cloud Imaging and Particle Size) Imagery

这项研究的主要目标是更好地了解极地夏季中间层动力学及其与低层大气的耦合。该方法的基础是对来自中间层冰的大气(AIM)卫星极地中间层云(PMC)观测的水平风和重力波(GW)结构的大型集合进行全面的数据分析。水平风将使用云风跟踪算法得到，该算法应用于在PMC表格的每个蝴蝶结图像中检测到的全套GW结构。云探测和GW分析将应用于AIM云成像和粒子大小实验(CIPS)仪器(2007-CURRENT)对南北半球(NH和SH)进行的PMC测量。这些风将根据每月的气候学或通过个别风场的巧合比较来验证。本科生和研究生的参与是预期的。在这些结果的基础上，将研究两个科学目标。第一个目标是量化每种类型的GW形态的GWS的出现频率。这些结果将被用来确定可能的GW源区，并考虑导致局部GW激发或GW事件向上和向极地传播到观测地点的风过滤条件。另一个科学目标是研究经过卫星混叠效应校正后的快速行星波。这些PW事件将使人们能够就AIM任务期间(2007年至今)在中间层风和PMC反照率中看到的PW活动的年际变化问题进行审查。这些结果还将确定PW活动与极地冬季平流层涡旋强度或对侧涡旋内部温度之间是否存在半球间的遥相关。这样的远程连接将有助于理解极地夏季PWS发展背后的驱动机制的细节。

The primary goal of this research is to achieve improved understanding of polar summer mesospheric dynamics and its coupling to the lower atmosphere. The methodology is based upon applying comprehensive data analyses to large ensembles of horizontal winds and gravity wave (GW) structures derived from the Aeronomy of Ice in the Mesosphere (AIM) satellite polar mesospheric cloud (PMC) observations. Horizontal winds will be derived using a cloud wind tracking algorithm applied to a full set of GW structures detected within each bowtie image of PMC forms. The cloud detection and GW analysis would be applied to the PMC measurements taken by the AIM Cloud Imaging and Particle Size experiment (CIPS) instrument (2007-current) for both northern and southern hemispheres (NH and SH). These winds would be validated in terms of monthly climatology or via coincidence comparisons for individual wind derivations. Undergraduate and graduate student participation is expected.Based on these results, two science objectives would be studied. The first objective would be the quantification of the occurrence frequency of GWs for each type of GW morphology. These results would be explored to determine possible GW source regions and to consider the wind filtering conditions that lead to either local GW excitation or the upward and poleward propagation of the GW event to the site of the observation. The other science objective is to study the fast traveling planetary waves (PWs) after correcting for the satellite aliasing effect. These PW events would allow the question of variability be examined regarding the inter-annual variability of the PW activity seen in the mesospheric winds and PMC albedo over the AIM mission period (2007-current). These results would also determine whether any inter-hemispheric tele-connection exists between the PW activity and the polar winter stratospheric vortex strength or temperature inside the vortex in the opposite hemisphere. Such a tele-connection would contribute toward understanding the details of the driving mechanism underlying the development of the polar summer PWs.